Lexington County, SC, gets 48 inches of rain per year. The US average is 37. Snowfall is 2 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 104.

On average, there are 218 sunny days per year in Lexington County, SC. The July high is around 92 degrees. The January low is 33. The comfort index, which is based on humidity during the hot months, is a 29 out of 100, where higher is more comfortable. The US average on the comfort index is 44.[7]

There were 83,240 households out of which 35.50% had children under the age of 18 living with them, 56.60% were married couples living together, 11.60% had a female householder with no husband present, and 28.10% were non-families. 22.50% of all households were made up of individuals and 6.90% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.01.

In the county, the population was spread out with 26.10% under the age of 18, 8.30% from 18 to 24, 31.60% from 25 to 44, 23.80% from 45 to 64, and 10.20% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 94.50 males. For every 100 females age 18 and over, there were 91.30 males.

The median income for a household in the county was $44,659, and the median income for a family was $52,637. Males had a median income of $36,435 versus $26,387 for females. The per capita income for the county was $21,063. About 6.40% of families and 9.00% of the population were below the poverty line, including 11.10% of those under age 18 and 9.30% of those age 65 or over.

On November 4, 2014, Lexington County residents voted against a proposed sales tax increase. The money generated from this tax would have mostly been used to improve traffic conditions upon roadways.[13] Likewise on November 4, 2014, residents voted to repeal a ban on alcohol sales on Sundays within the county.[14]